What payment processors do you use?

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Thank you for your replies! I especially feel thankful because you pointed out the importance of APIs. Providing a stable API is very important feature of a provider. Maybe, the provider's site is clean and secure, but above a certain level API usage becomes more important because of the development of business applications, system integrity and automation. I think, anyone who was looking for payment processors got some info on them already from this discussion so I am closing this now. Thank you for your help!